He is the son of the late Sergeant of Arms Howard S. Liebengood, who died in 2005
Officer Who Defended Capitol During Riots Dies of Apparent Suicide
https://www.thedailybeast.com/howard-liebengood-officer-who-defended-capitol-at-dc-riots-dies-by-apparent-suicide-reports-say
I decided to search the FBI Vault https://vault.fbi.gov/
All seem to be connected to insurrection WW2 and Kent State.
More eyes would help.
some links...
https://www.thedailybeast.com/howard-liebengood-officer-who-defended-capitol-at-dc-riots-dies-by-apparent-suicide-reports-say
https://www.legacy.com/obituaries/washingtonpost/obituary.aspx?n=howard-s-liebengood&pid=3045150
https://vault.fbi.gov/anti-war-movement
https://vault.fbi.gov/world-war-ii
https://vault.fbi.gov/howard-baker/howard-baker-part-01-of-03/view
https://vault.fbi.gov/
(post is archived)